First I found The North Adams Transcript of 21 Feb 1899 reporting the following:
Somerville, Mass., Feb. 21. - While temporarily deranged, owing to a severe attack of the grip, Walter Mower of this city shot his wife in the right breast yesterday. The chances are in favor of her recovery. Mower, it is said, has been partly insane for a days [sic] or two, and imagined that there was an attempt being made to send him to an insane hospital. He became more violent yesterday and procured the weapon with which he attempted to kill his wife.
Further surfing brought up an article in the 22 Feb 1899 issue of the Boston Daily Advertiser: